Fatal-on-data-error mlr -x option

[johnkerl]

For #1106.

More examples in on-line docs but TL;DR

mlr --csv --from data-error.csv cat
x
1
2
3
text
4

mlr --csv --from data-error.csv put '$y = log10($x)'
x,y
1,0
2,0.3010299956639812
3,0.4771212547196624
text,(error)
4,0.6020599913279624

mlr -x --csv --from data-error.csv put '$y = log10($x)'
x,y
1,0
2,0.3010299956639812
3,0.4771212547196624
mlr: data error at NR=4 FNR=4 FILENAME=data-error.csv
mlr: field y: log10: unacceptable type string with value "text"
mlr: exiting due to data error.

Also with -x in ~/.mlrrc or export MLR_FAIL_ON_DATA_ERROR=true.